Microsoft Technology Licensing, LLC

Crowdstrike, Inc.

Marina Simakov

Tal Arieh Be'ery

Tal Joseph Maor

Yaron Zinar

Itai Grady Ashkenazy

Idan Plotnik

Sivan Krigsman

Michael Dubinsky

Gil David

Sagi Sheinfeld

Michael Dolinsky

Avraham Kama

Chaim Menachem Hoch

A security agent configured to initiate multifactor authentication (MFA) in response to security triggers occurring on a computing device. Upon occurrence of a security trigger, the security agent delays action associated with a process on the computing device and provides, to a display of a user of the computing device, a prompt asking if the security trigger resulted from an action of the user. The security agent then initiates MFA with an MFA provider to authenticate the user and, based at least on a result of the MFA and the user answer to the prompt, takes further action. The user answer may be provided separately from the MFA or through successful completion of the MFA.

Use of multifactor authentication in assessing suspicious activity

Methods and systems for detecting forged Kerberos protocol tickets are presented. In one embodiment, a method is presented that includes receiving and decrypting an authentication request including a ticket. A validity start time and a validity end time may then be extracted from the ticket and a validity period may be calculated based on the validity start time and the validity end time. The method may then include retrieving a domain validity period from a domain controller and comparing the validity period to the domain validity period. If the validity period differs from the domain validity period, the authentication request may be blocked.

Network-based Kerberos ticket forgery detection

A method is provided for verifying an authentication request to a computer network. The method may include receiving a network packet and extracting an authentication request from the network packet. The authentication request may be encrypted to store attribute-value pairs, and the method may further include decrypting the authentication request to access the attribute-value pairs. The method may also include extracting a target name and a device name from the attribute-value pairs, wherein the device name indicates an identified target device, and determining whether the target name refers to the identified target device identified by the device name.

Network-based NT LAN manager (NTLM) relay attack detection and prevention

Embodiments are directed to monitoring local users' activity without installing an agent on a monitored machine. Periodic scans of the local users' directory using the standard protocol messages and APIs of a remote admin interface provide access to local machine data. Using the remote admin interface, defenders gain visibility to local users' logons, group membership, password changes, and other parameters. Security applications enabled by this visibility include, but are not limited to, abnormal logons detection, abnormal group addition and removal detection, and abnormal password changes detection.

Detecting local user security-related anomalies using active scans

The network logon protocol used in a pass-through authentication request embedded in an encrypted network packet is identified. A protocol detection engine correlates events and network requests received at a domain controller in order to use the data contained in a correlated pair to determine a size of a challenge response in the encrypted network packet. The size of the response is used to identify the network logon protocol used in the pass-through authentication request.

Detection of the network logon protocol used in pass-through authentication

Brute force attacks on a given account with various password attempts are a common threat to computer security. When a suspected brute force on an account is detected, systems may lock the account from access, which is frustrating to users and time consuming for administrators in the event of a false positive. To reduce the number of false positives, brute force counterattacks are taught in the present disclosure. A brute force counterattack is used to learn whether the login attempts change the passwords attempted, and are to be classified as malicious, or keep the attempted password the same in multiple attempts, and are to be classified as benign.

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Ashdod, Israel

Marina Simakov